#include "secp256k1.h"

Typedefs
typedef int(*	secp256k1_ecdh_hash_function) (unsigned char output, const unsigned char x, const unsigned char y, void data)

Functions
SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int	secp256k1_ecdh (const secp256k1_context ctx, unsigned char output, const secp256k1_pubkey pubkey, const unsigned char privkey, secp256k1_ecdh_hash_function hashfp, void *data) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4)

Variables
SECP256K1_API const secp256k1_ecdh_hash_function	secp256k1_ecdh_hash_function_sha256

SECP256K1_API const secp256k1_ecdh_hash_function	secp256k1_ecdh_hash_function_default

Typedef Documentation

◆ secp256k1_ecdh_hash_function

typedef int(* secp256k1_ecdh_hash_function) (unsigned char *output, const unsigned char *x, const unsigned char *y, void *data)

A pointer to a function that applies hash function to a point

Returns: 1 if a point was successfully hashed. 0 will cause ecdh to fail Out: output: pointer to an array to be filled by the function In: x: pointer to a 32-byte x coordinate y: pointer to a 32-byte y coordinate data: Arbitrary data pointer that is passed through

Function Documentation

◆ secp256k1_ecdh()

SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdh	(	const secp256k1_context *	ctx,
		unsigned char *	output,
		const secp256k1_pubkey *	pubkey,
		const unsigned char *	privkey,
		secp256k1_ecdh_hash_function	hashfp,
		void *	data
	)

Compute an EC Diffie-Hellman secret in constant time Returns: 1: exponentiation was successful 0: scalar was invalid (zero or overflow) Args: ctx: pointer to a context object (cannot be NULL) Out: output: pointer to an array to be filled by the function In: pubkey: a pointer to a secp256k1_pubkey containing an initialized public key privkey: a 32-byte scalar with which to multiply the point hashfp: pointer to a hash function. If NULL, secp256k1_ecdh_hash_function_sha256 is used data: Arbitrary data pointer that is passed through

Variable Documentation

◆ secp256k1_ecdh_hash_function_default

SECP256K1_API const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_default

A default ecdh hash function (currently equal to secp256k1_ecdh_hash_function_sha256).

◆ secp256k1_ecdh_hash_function_sha256

SECP256K1_API const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_sha256

An implementation of SHA256 hash function that applies to compressed public key.

Typedefs

Functions